Chimney-cap



C. DOUGLAS.

y ChimneyfCap.

NQ. 24,107. i Patented May 24, 1859.

NITED STATES PATENT OFFICE.

CHARLES DOUGLAS, OF HEBRON, CONNECTICUT.

CHIMNEY-CAP.

Specification of Letters Patent No. 24,107, dated May 24, 18159.

To all whom it may concern:

Be it known that I, CHAS. DOUGLAS, of Hebron, in the county of Tolland and State of Connecticut, have invented a newand useful Improvement in Smoke-Jacks or Ventilators for the Use of Vessels, Steamboats, Railroad-Cars, &c.; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings,'making a part of this specication, in which- Figure 1 is a perspective view, and Fig. 2 is a vertical section of a smoke-jack einbracing my improvement.

A is the base, of either cast or sheet metal, made crowning, in which there is a neck (B) suliciently large inside to receive the smokepipe which it is designed to cover.

E is an inverted cone of sheet metal, made stationary directly over the base (A) by means of the iron standards (F, F, F,

D is a conical valve, suspended from the inverted cone (E) upon the round head of the bolt (e) at d.

C is avalve equal in diameter to valve D, with a hole through the center suliiciently large to allow it to play loosely over the neck (B). There is a strap of iron (b) riveted to valve C, which extends across it, in the center of which there ispermanently attached a short rod (c) which stands perpendicularly with the valve.

a is a strap which extends across inside the neck (B), in the center of which there is a hole to receive the lower end of the rod (c), at which point the valve is suspended and works freely. There is a strap (f) riveted to the valve (D), which extends down in the center sulficiently to give the proper motion to the valve. In the center of this strap there is a hole in which the upper end of the rod (c) is made to play loosely.

This smoke-jack is designed to be secured to the deck or roof, over the opening through which the stove-pipe passes, and the upper end of the pipe is to be placed inside of the neck (B). The space between the valves is fully equal to the area of the flue through the neck (B), and is not diminished when the edges are brought together on one side, consequently the smoke is not at any time obstructed in the least in its I escape.

The valves are so connected with each other by means of the rod (c) of the lower valve passing up through the hole in the strap (f) of the upper valve, that one cannot act independent of the other, and when the wind strikes them from any quarter the edges of the valves are instantly closed together on the windward side and are thrown open wider on the leeward side, as represented by the dotted lines in Fig. 2. By this arrangement the wind is effectually prevented from driving down the pipe or flue, from whatever quarter it may blow or baille, and furthermore, it is thrown olf in -such angles in passing the valves as to cause an increase of draft in the flue.

The conical form of the top (E) and the raised form of the base are quite essential to the sure and prompt working of the valves, as they turn the lcurrent of the wind so directly against said valves that they are operated by the slightest breeze.

Each valve is so accurately balanced upon the point on which it plays that it has no inclination to tip to one side or the other when the smoke-jack is rocked about, and hence it is rendered more practical for vessels, cars, &c., where the motion would otherwise effect the position of the valves in relation to each other.

The valve (D) rests upon the flat surface of the bolt head, (at d), and the lower valve rests upon a similar surface. They are thereby held parallel with each other, unless acted upon by the wind. Y

I contemplate using these devices, also, for Ventilating buildings, &c.

I claiml. The valves C, and D, and the manner and position in which they are suspended,

.substantially as described, and for the purposes set forth.

'2. The arrangement of the neck B, the top E, Gr, and the standards F, F, F, in combination with the valve D, or its equivalent, substantially as and for the purposes herein specified.

CHAS. DOUGLAS.

Witnesses:

LUoIUs J. HENDEE, EBEN B. PAGE. 

